<template>
  <div id="home">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control
      :titles="['流行', '新款', '精选']"
      @tabClick="tabClick"
      ref="tabControl1"
      class="istabcontrol"
      v-show="istabfixed"
    ></tab-control>
    <scroll
      class="content"
      ref="scroll"
      :probe-type="3"
      @scroll="contentscroll"
      :pull-up-load="true"
      @pullingUp="loadMore"
    >
      <home-swiper :banners="banners" @SwiperimageLoad="SwiperimageLoad" />
      <recommend-view :recommends="recommends" />
      <feature-view></feature-view>
      <tab-control
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      ></tab-control>
      <good-list :goods="showGoods"></good-list>
    </scroll>
    <back-top @click.native="backclick" v-show="isShowBackTop"></back-top>
  </div>
</template>

<script>
import HomeSwiper from "./childComps/HomeSwiper";
import RecommendView from "./childComps/RecommendView";
import FeatureView from "./childComps/FeatureView";

import NavBar from "components/common/navbar/NavBar";
import TabControl from "components/content/tabControl/TabControl";
import GoodList from "components/content/goods/GoodsList";
import Scroll from "components/common/scroll/Scroll";
// import BackTop from "components/content/backTop/BackTop";

import { getHomeMultidata, getHomeGoods } from "network/home";
// import { debounce } from "common/utils";
// 导入混入对象
import { backTopMixin } from "common/mixin";

export default {
  name: "Home",
  components: {
    HomeSwiper,
    RecommendView,
    FeatureView,

    NavBar,
    TabControl,
    GoodList,
    Scroll,
  },
  mixins: [backTopMixin],
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",

      tabOffsettop: 0,
      istabfixed: false,
      saveY: 0,
    };
  },
  created() {
    // 1.请求多个数据
    this.getHomeMultidata();
    // 2.请求多类goods数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },

  mounted() {
    // 1.图片加载完成的事件监听
    // const refresh = debounce(this.$refs.scroll.refresh, 50);
    this.$bus.$on("itemimageload", () => {
      this.$refs.scroll.refresh();
      // refresh();
    });
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    },
  },
  activated() {
    this.$refs.scroll.scrollTo(0, this.saveY, 0);
    this.$refs.scroll.refresh();
    // console.log("activated");
  },
  deactivated() {
    // console.log(this.saveY);
    this.saveY = this.$refs.scroll.getScrollY();
    // console.log("deactivated");
  },
  methods: {
    // 2.获取tabControl的位置offsettop
    // 组件没有对应的offsetTop
    // $el获取组件元素
    SwiperimageLoad() {
      this.tabOffsettop = this.$refs.tabControl2.$el.offsetTop;
    },
    // 事件监听方法
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl2.currentIndex = index;
      this.$refs.tabControl1.currentIndex = index;
    },
    contentscroll(position) {
      // 判断backtop是否显示
      this.listenShowBackTop(position);
      // 2.决定tabcontrol是否吸顶
      this.istabfixed = -position.y > this.tabOffsettop;
    },
    loadMore() {
      this.getHomeGoods(this.currentType);
    },
    // 网络请求方法
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        // this.result = res;
        // console.log(res);
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        // 将数组push进去
        this.goods[type].list.push(...res.data.list);
        // 页码加一
        this.good[type].page += 1;
        // 重新激活上拉加载更多
        this.$refs.scroll.finishPullUp();
      });
    },
  },
};
</script>

<style scoped>
/* // scoped:样式作用域 */
#home {
  /* padding-top: 44px; */
  height: 100vh;
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
  /* position: fixed;
  right: 0;
  left: 0;
  top: 0;
  z-index: 9; */
}
.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  right: 0;
  left: 0;
  bottom: 49px;
}
.istabcontrol {
  position: relative;
  z-index: 9;
}
/* .content {
  height: calc(100% - 93px);
  overflow: hidden;
  margin-top: 44px;
} */
</style>
